You spend hours in your browser every day. Hell, Google Chrome is even a full-fledged operating system. The more shortcuts you know, tricks you master, and tweaks you understand, the more quickly and efficiently you can use your browser—whether you're checking Facebook, buying something on Amazon, or, you know, doing bona fide work. Whether you're a Chrome lover or a Firefox fanatic, get to know the best features of your favorite browser with our power user's guides for Firefox and Chrome.